Composite electric system.



A. D. T. LIBBY.

COMPOSITE ELECTRIC SYSTEM APPLICATION FILED 1m. 2a, 1910.

LJLWJWW Patented Apia 27,1915.

2 SHEETSSHEET 1- Wl7'esses [D MVP/7757" n Alb/0n D. 7fL/by A. D. T. LIBBY.

: COMPOSITE ELECTRIC SYSTEM.

APPLICATION FILED MN, 28, 1910."

Patented Apr. 27, 1915.

2 SHEETS-SHEET 2.

FFI@E.

ALBION T. LIBIBY, F ELYRIA, OHIO, ASSIGNOR, BY MESIFTE ASSIGNMENTS, TO THE GAEFORD MANUFACTURING COIVIT'ANY, OF I ELYRIA, QHIO, .A CORPORATION OE cnro.

To all whom it may sonata.

Be it known that I, ALBION T.LiBBY, a citizen of the United States, residing at -Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Composite Electric Systems; and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, such as will. enable others skilled in the art to which it apper-.

tains to make anduse the same. I My invention relates to 0011113031136 systems consisting in combined telephone and "police systems, and more particularly to those systems in which the means for calling the patrolmen are provided at the police boxes along the .line of the patrolmans beat. Such systems are described in certain pending" applications made by me, and I connal arran ement designated to draw the at template improvements upon these systems.

I refer to application 515,044, Aug. 28, 1909; i

540,571 man ate Jan. 25,1910.

I intendto utilize two conductors for pur- I poses of: telephoning, signaling the main station, and for controlling the operation of tention o the patrolman even though he be some distance from. the box. This si nal i controlled over the two'conductors of the described in the illustrated n the drawings, with such var1atelephone line, them as well. i

The invention consists of the combination of circuits and ap aratus-subst-anti-ally as etailed description and and may be operated over tions as the claims will admit wheninterpreted in vieuf of'the prior art and the description.

Referring now to the drawings, Figure 1 is one form of the circuit arrangement of my invention. Fig. 2 is a second form. Fig. 3 is a third form.

Referring first to Fig. 1, at A Ishow the apparatus assembled at the police or main station. 'Thisapparatus is under the care Y lightness aiehigfaiiiaar 28,1910. terminations. j

corrrosirsnrncrnic srsrnn;

Qpecification of Letters Patent. Pattentlafl Apr. 27,-1.9!Ii5;

of an attendant. At C and l) I showthe apparatus which is assembled at the snbe stations, or the police boxes. The substation apparatus consists of a telephone receiver S, the transmitter T, hook switch H and a. non-inductive resistance I connected in bridge of the two main conductors'l and 2. In a second bridge of this line I show a condenser J and relay R The condenser J is adapted to be shunted by a short circuit 3. This short circuit is controlled by thearmature dot the relay R When direct current isthrown upon the system the current charging the condenserfis sufiicient to energize the relay R to close this shunt about the condenser. Current thereupon flows through the relay and shunt to hold up the second armature 6. This armature is in a shunt of the relay R and condenser J and contains the lamp L. The lamp L is placed within the patrolmans box and serves when illuminated to attract the attention of the patrolman. Connected in series in the circuit I show a police signal sending device E which opens and closes a switch in the normally closed circuit. This produces an interruption of current in the system which causes the operation of the police signal ii'eceiving mechanism Q, at the main station. At- N I show a manually operated switch which can be operated to interrupt the cur rent of this circuit, sending impulseswhich are for the purpose of delivering a special signal at the main station. At the last station onthe system I show a high inductive resistance W connected in the circuit for a purpose to be described. At the mainstation the line relayis shown at R, and, connected in Series therewith. a relay R which controls the operation of the police signal receiving device. R 'is the-relay of this device. The line signal controlledby the relay R is shown at L At K I-show the attendants listening key. B is a source of current which is used to operate the relays It and the lamps 11. The connection of this source to the line is controlled by a-re.- lay B A switch K, is used to initially operate this relay which immediately locks itself down. In the circuit of the source 13 I-show a relay R which controls a switch in the locking circuit of the relay R The amount of current flowing through the circuit including the relay R or the lamp L., isno t"great enough toenergi ze this relay. Upon removing the receiver from the hook, the low resistance of the telephone instrument circuit permits the flow of sulficient current to energize the relay R so that the circuit of R is broken and the source of current B is authmatically disconnected from the 'line.

. switch for manually effecting the interruption of the locking circuit of R The flow of current through the normally closed circuit including the battery B, relays R and R, the conductors 1 and 2, the police signal sending devices, and the resistance coil W,

is sufficient to energize the relay R but insuliicient to energize relay R. \Vhen a substation bridge is closed, the resistance-VV being shunted thereby, the current flow is sufficient to operate both R and R When the line circuit is interrupted at the armature contacts of R the-relay R Wouldbe deenergized and its armature released to operate the police signal receiving apparatus Q. To prevent this I provide a relay R which is energized by the closure of key K closing a circuit through relay R independent of the line conductors.

The particular nature and the functions of the apparatus will be best understood from the description of the operation.

The operation is as follows: Should a' B-ground at G The attendant having ob-- served this signal, throws over the listening key closing the switches 2 l--25, 26-27 and bridging on his telephone set. The talking circuit will be readily apparent and will not be described. Assuming that the receivers are on the hooks at the various police boxes and that a patrolman desires to send in a signal to be received by the device Q and to recorded thereby,he operates the motordriven circuit interrupter E which opens and closes the following closed circuit: from E--through conductor 2to and through the relays R and Rbattery-ba ck through conductor 1resistance \Vand the inter-. rupter E. This circuit is, with the exception of the resistance V, the same as that already traced. The current through this circuit will operate the relay R which opens and closes the circuit of the relay R which in turn controls the mechanism Q. These impulses, however, will be ineffective to operate the relay R. Should there be reason to At K I show a call the patrolman along the beat, the attendant at the central oflice will throw the 'key K closing a circuit through ground Gswitch 28-29conductor 30-re\lay Rbattery B ground G The relay R will be energized, attracting its armatures 8, l9 and 31. The line circuit is broken at 18-19 and 8-9, and the current source B closed upon the line at 8-32 and 19-33. At first the impulse of current flows from battery B -33-19to relays R on one side, through relay R -3'281on the other side to charge the condenser J. This flow is sutlieient to energize the relays R which pull up their armatures 4 closing the switch 4l5 and the shunt 3 about the condenser J. Current then flows over this circuit through the said shunt and the relays it which lock up the armatures 6 closing the bridges of the lamps L which are now operated by current from this battery. As long as the resistance of any one of the devices: the relays R, the lamps L, or the device W'is in this circuit, the flow of current is not great enough to operate the relay it. When a patrolman at one of the stations takes down the receiver placing the low resistance bridge of the telephone set across the lines, the current flow is immediately increased so that is energized to pull up the armature 40, opening the switch 40- 11 in the locking circuit of relay R. This locking circuit will become effective immediately upon the energization of R which may be traced as follows: groundG battery B.through the relay It and the guard lamp L in multiple3ll2iO -l1the key K to ground at G. The interruption of this circuit causes the decncrgization of relay R" which lets go its armature, disconnecting the source B extinguishing the lamps and restoring the line circuit through to the attendants listening key. )uring the interruption of the line circuit, the relay R was energized first over a circuit from ground G 2829-fi llt battery B-to ground G Relay R pulled up its armature L5, closing the switch 45-11-G and locking itself through the conductor l7- switch -lO--l1-to ground at (1". 'lhl'ough this circuit the relay R was maintained onergized preventing the operation of the mechanism Q. The energization of the relay 11 upon response at a substation, interrupted this circuit and again placed the relay R under control of the intcrrupters in the line circuit. 11. will thus be seen that I have produced a combined telephone and police system in which the transmissions of various characters necessary to perform the desired communications, are conducted over two conductors.

Fig. 2 is a modified circuit, following in general the system of Fig. 1. In this, instead of using a source of continuous ourit is unnecessary to provide any means for maintaining the circuit of the relay R closed during the application of said current to line.

Fig. 3 i. In

still another modification.

this syste 1 the lamps L are lighted over conductors independent of the telephone sy tem and are controlled by the relays R which lllit" be energized by current from the alterrr tor X which operates'directlythrough this condensers J.

In Figs. l1 and 3 I show a switch 100-101 in the circuit of the ,line lamp L. This switch is controlled by the key K, and is opened when K is thrown to connect on the tacts of the members E and N,

ing said-signals to spid attendants' telephone set. The opening oil? the switch interrupts the circui of the lamp L and extinguishes the samej. The voice currents are prevented from passing through the bridges of the relays R by the reactance, devices contained therein. The currents, however, may readily pass through'the cone The lamp L serves as a guard lamp indicating when the relaylit is energized or the fact that the source of lighting current is connected to the lamps L and that it has been disconnectedor that response has been made at the substation.

While I have shown these particular forms of circuit-and arrangement of apparatus, it will be obvious to those skilled in the art that numerous and extensive, de-

partures from the forms and the details thereof and the apparatus here shown may be made without departing from the spirit of this invention.

I claim:

1. In. a composite systemconsisting of a combined police and telephone system, the combination of of substations, a pair. of conductors connecting said stations, telephone instruments adapted .to be connected in circuit with said conductors, police signaling and receiving apparatus connected in a series circuit with said conductors, lamp signals, and means for connecting said signals in circuit with said conductors, said means under control of the attendant at the main station.

2. In a composite system consisting of a combined telephone and police system, the combination of a main station, a plurality of substations, a pair of conductors connecting said stations, telephone instruments adapted to be connected to said conductors, signals at said stations, means for connectconductors, police a main station, a plurality' circuit With said means, said means operable byan impulse of currentthrough the circuit of said condenser and when so operated adapted to shunt said condenser.

In a composite system, consisting of a combined police and telephone system, the combination of a main station, a plurality of substations,

stations, telephone instruments adapted tobe connected to said conductors, police signal sending and receiving apparatus operating signals at said stations adapted to be connected to and to be operated over said conductors,

oversa'id conductors, relays controlling the circuit of said signals, a condenser in circuit with each relay,each relay adapted to be acconductors connecting saidsignal sending and recording apparatus opcrating over sa1d conductors, a condenser 1n tuated by an; impulse of current and whenso actuated, shunting said condensers. y

4. In a composite system, consisting of substations, a mg said stations, telephones adapted to'be connected to said conductors, police signal a I combined police and telephone system, the combination of a main station, a plurality of pair of conductors connectsending and receiving apparatus operating over said conductors, tions adapted to be connected to said conductors, means operable over-said conductors controlling said signals, the circuit of said means beingimpervious to a continuous signals at the substacurrent, and means to render said circuit permeable to such currents. I

In a composite system consisting of a combined police combination of a main station, a plurality of substations, conductors connecting said statio s, said conductors being common to a telephone and apolice signaling system, signals at said substations, relays operable over said conductors controlling saidsignals, the circuits being impervious to a" continuous current, said relayadapted to be energized by an impulse of current through said conductor and -when so energized operating to render itscircuit permeable to continuous currents.

6. In a composite system, consisting of a comb ned police and telephone system, thea combination of a main station, of substations,

ing the same, telephone,instruments adapted to be connected to said conductors, police signal sending and receiving apparatus operating-over said conductors, signals at said stations adapted to be connected to said conductors, a Source of current, means under control of the main station attendant governing the connection of said signals to said source, the circuit of the said means being impervious to continuous current, said means adapted when operated to render its circuit permeableto such currents.

7. Ina composite system consisting of a a plurality a pair of conductors connectand telephone system, the

combined police and telephone system, the combination of a main station, a plurality of substations, a pair of conductors connecting the same, telephone instruments adapted to be connected to said conductors, a signal at each station adapted to be connected to said conductors, a source of current, a relay at each station controlling the signal thereat, said relay undercontrol of the main station attendant, a circuit for said relay impervious to continuous currents, said relay adapted when energized to change said circuit so that continuous currents may traverse the same. I

8. In a composite system consisting of a combined police and telephone system, the

combination of a main station, a plurality of substations, a pair of conductors connecting said stations, telephone instruments adapted to be connected in circuit with said conductors, police signal sending devices connected in a closed series circuit with said conductors, lamp signals at said substations, circuits therefor, and means controlling the circuits of said lamps connected in circuit with said conductors, said means controllable from the main station.

9. In a composite system consisting of a combined telephone and police system, the combination of a main station, a plurality of substations, a. pair of conductors connect ing said stations, telephone instruments adapted to be connected in circuit with said conductors, police signal sending devices connected in a closed series circuit with said conductors, lamp signals at said substations, circuits therefor, and means controlling the circuits of said lamps connected in circuit with said conductors, said means controllable from the main station over said conductors.

10. In a composite system consisting of a combined telephone and police system, the combination of a main station, a plurality of substations, a pair of conductors connecting the same, telephone instruments at the substations, adapted to be connected in circuit therewith, signal receiving devices at the main station responsive to the use of the telephone instruments, police signal sending apparatus operative to send signaling current over said conductors, lamp signals at the substations, means controlling said signals, said means governed over said conductors, and means to prevent interference among said devices, apparatus and lamp controlling means.

11. In a composite system consisting of a combined police and telephone system, the combination of a main station, a plurality of substations, a pair of conductors connecting the same, telephone instruments adapted to be connected in circuit with said conductors, police signal sending apparatus connected in a closed series circuit with said conductors, receiving means for the signals thereof at the main station, means for severing the connection between the said police signal sending and receiving apparatus, and means for closing a second circuit through the receiving device during the severance of said connection.

12. In a composite system consisting of a combined police and telephone system, the combination of a main station, a plurality of substations, a pair of conductors connecting said stations, telephone instruments at said stations adapted to be operated for conversational communication over said conductors, police signal sending apparatus, said conductors constituting a circuit therefor, lamp signals at said stat-ions, said lamps controlled and operated over said conductors.

13. In a composite system consisting of a combined police and telephone system, the combination of a main station, a plurality of substations, a pair of conductors connecting said stations, telephone instruments at said stations adapted to be operated for conversational communication over said conductors, police signal sending apparatus, said conductors constituting a circuit therefor, lamp signals at said stations, said lamps adapted to be operated over said eonductors, a source of current, and means under control of the main station attendant for connecting said lamps in circuit with said source.

In testimony whereof I allix my signature in presence of two witnesses.

A. I). T. LIBBY.

W'itnesses F. RICIIEY, Jos. J. Miznn. 

